Selasa, 18 Desember 2012

rangkuman aircraft hardware and tools


Nama : RR Alvina
NIM : 111221026
Kelas : 2 Aeronautika
Mechanically Expanded Rivets
Two classes of mechanically expanded rivets are discussed
here:
(1) Nonstructural.
(a) Self-plugging (friction lock) rivets.
(b) Pull-thru rivets.
(2) Mechanical lock, fl ush fracturing, self plugging rivets.

Self-Plugging Rivets (friction lock)
The self-plugging (friction lock) blind rivets are manufactured by several. Self-plugging (friction lock) rivets are fabricated in two parts: a rivet head with a hollow shank or sleeve, and a stem that extends through the hollow shank. Several events, in their proper sequence, occur when a pulling force is applied to the stem of the rivet:
(1)    the stem is pulled into the rivet shank;
(2)    the mandrel portion of the stem forces the rivet shank to expand; and
(3)   when friction (or pulling action pressure) becomes great enough, it will cause the stem to snap at a breakoff groove on the stem.

Self-plugging (friction lock) rivets are fabricated in two common head styles: (1) a protruding head similar to the MS20470 or universal head, and (2) a 100° countersunk head. Other head styles are available from some manufacturers.

Material composition of the rivet shank depends upon the type of material being riveted. Aluminum alloy 2117 shank rivets can be used on most aluminum alloys. Aluminum alloy 5056 shank rivets should be used when the material being riveted is magnesium. Steel rivets should always be selected for riveting assemblies fabricated from steel.

Pull-Thru Rivets
Pull-thru rivets are fabricated in two parts: a rivet head with a hollow shank or sleeve and a stem that extends through the hollow shank

Several events, in their proper sequence, occur when a pulling force is applied to the stem of the rivet: (1) The stem is pulled through the rivet shank; (2) the mandrel portion of the stem forces the shank to expand forming the blind head and filling the hole.

Pull-thru rivets are fabricated in two common head styles: (1) protruding head similar to the MS20470 or universal head, and (2) a 100° countersunk head. Other head styles are available from some manufacturers.

Each company that manufactures pull-thru rivets has a code number to help users obtain correct rivet for the grip range of a particular installation. In addition, MS numbers are used for identification purposes. Numbers are similar to those shown on the preceding pages.

Self-Plugging Rivets (Mechanical Lock)
Self-plugging (mechanical lock) rivets are similar to self-plugging (friction lock) rivets, except for the manner in which the stem is retained in the rivet sleeve. This type of rivet has a positive mechanical locking collar to resist vibrations that cause the friction lock rivets to loosen and possibly fall out. Self-plugging (mechanical lock) rivets display all the strength characteristics of solid shank rivets and in most cases can be substituted rivet for rivet.

Bulbed Cherrylock Rivets
The large blind head of this fastener introduced the word “bulb” to blind rivet terminology. In conjunction with the unique residual preload developed by the high stem break load, its proven fatigue strength makes it the only blind rivet interchangeable structurally with solid rivets.

Wiredraw Cherrylock Rivets
There is a wide range of sizes, materials, and strength levels from which to select. This fastener is especially suited for sealing applications and joints requiring an excessive amount of sheet takeup.

Huck Mechanical Locked Rivets
Self-plugging (mechanical lock) rivets are fabricated in two sections: a head and shank (including a conical recess and locking collar in the head), and a serrated stem that extends through the shank. Unlike the friction lock rivet, the mechanical lock rivet has a locking collar that forms a positive lock for retention of the stem in the shank of the rivet.

Material
Self-plugging (mechanical lock) rivets are fabricated with sleeves (rivet shanks) of 2017 and 5056 aluminum alloys, Monel, or stainless steel.The mechanical lock type of self-plugging rivet can be used in the same applications as the friction lock type of rivet.Composition of the material being joined together determines the composition of the rivet sleeve; for example, 2017 aluminum alloy rivets for most aluminum alloys and 5056 aluminum rivets for magnesium.

Head Styles
Self-plugging mechanical locked blind rivets are available in several head styles depending on the installation requirements.


Diameters
Shank diameters are measured in 1/32-inch increments and are generally identified by the first dash number: -3 indicates 3⁄32 inch diameter, -4 indicates 1⁄8 inch diameter, and so forth.
Both nominal and 1⁄64-inch oversize diameters are available.

Grip Length
Grip length refers to the maximum total sheet thickness to be riveted and is measured in 1⁄6 of an inch. This is generally identified by the second dash number. To determine the proper grip rivet to use, measure the material thickness with a grip selection gauge (available from blind rivet manufacturers).

Rivet Identification
Each company that manufactures self-plugging (friction lock) rivets has a code number to help users obtain the correct rivet for the grip range or material thickness of a particular installation. In addition, MS numbers are used for identification purposes

Special Shear and Bearing Load Fasteners
Many special fasteners produce high strength with light weight and can be used in place of conventional AN bolts and nuts. Special fasteners eliminate this loose fit because they are held in place by a collar that is squeezed into position.

·         Huck Manufacturing Comany
9SP-B A 6 3
9SP-B Head Style
9SP-B = brazier or universal head
9SP-100 = 100o countersunk head
A Material composition of shank
A = 2017 aluminium alloy
B = 5056 aluminium alloy
R = mild steel
6 Shank diameter in 32nds of an inch:
4 = 1.8 inch 6 = 3.16 inch
5 = 5.32 inch 8 = 1.4 inch
3 Grip range (material thickness) in 16ths of an inch

·         Military Standard Number
MS 20600 B 4 K 2
MS Military Standard
20600 Type of rivet and head style:
20600 = self-plugging (friction lock) protruding head
20600 = self-plugging (friction lock) 100o countersunk head
B Material composition of sleeve:
AD = 2117 aluminium alloy
B = 5056 aluminium alloy
4 Shank diameter in 32nds of an inch:
4 = 1.8 inch 6 = 3.16 inch
5 = 5.32 inch 8 = 1.4 inch
K Type of stem:
K = knot head stem
W = serrated stem
2 Grip range (material thickness) in 16ths of an inch

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